As other reviewers have stated, it does fail to keep you interested in the story. I just don't think the story was told in the best way possible. Unfortunately, IMDB does not have the interviewees labeled with photos next to the names so it is hard to point out in this review who I am I about to refer to. But there is one man there who I call "Captain Obvious" to be incredibly annoying. He seems to think he is giving expert analysis of the murder, but all he really does is paraphrases the killer's own thoughts in the killer's letters. He comes off as trying to give expert analysis of the killer but all he does is regurgiate the letters. I was like seriously Captain Obvious, that's your expert analysis?
Perhaps another documentarian crew could have made a better job with this story. But this version is sophmoric.